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2015年3月11日—Thegiantfreshwaterstingrayhasthelongestspineofanyspeciesofray,upto15inches,andcarriespowerfulvenom.Theanimalusesitsspine ...

In 2009, the ray was 6.5 feet (2 meters) across and 15 feet (4.58 meters) long. “Her tail might have been shortened by some accident,” says Nantarika. The ray also had bite marks that may have come from a male ray.

By knowing how much time had elapsed since the ray was last studied, scientists now have a better idea about how fast rays can grow. Like most fish, they keep growing as long as they live and can find enough food. Giant stingrays are bottom feeders, preying on fish, prawns, mussels, clams, and whatever else they can find. Scientists don’t know how long the rays can live, but Nantarika estimates this one is between 35 and 40 years old, based on its size.

Hogan keeps track of freshwater fish size records through his Megafish Project[1], which studies the world’s biggest freshwater fish, and says the previous size record...